92e16ee87374 ("instrument/daq: Add an explicit time column to the DAQ
measurements") added a time column to the DAQ measurements in order to
help correlate them with those of other collectors like
FtraceCollector. Sadly, FTrace uses CLOCK_BOOTTIME instead of
CLOCK_MONOTONIC by default. CLOCK_MONOTONIC is like CLOCK_BOOTTIME,
except that it stops when the device suspends, which is why I hadn't
spot the issue until now.
Switch to CLOCK_BOOTTIME to get the intended behaviour of the original
commit.
